Up hill; too steep is when your tires don't pull anymore or your engine quits because it can't get fuel.
Downhill? When your grill and bumper stop you.
I've seen what I would loosly call "vertical" faces climbed up and down by 4 X 4's. I have a carb so can't go as steep, I think, compared to Fuel injected. Down hill you are restricted by speed. How fast do you want to go and how long of a run-out do you have? Too long and steep of a down hill and you might develope oil pressure problems. A 45 degree slope (100% grade)should be fine for either direction. Steeper than that going down might cause an oil issue but not if momentary. If you hear it start to knock. Shut it down.
GS
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